To open preferences, select [File] > [Various Settings] > [Preferences] from the menu.
You can change the default application for viewing PDF files in the [Association] tab.
Click on [Change Default Application] to access the properties screen for PDFs.
The application that you set in the screen that appears when you click [Change] will be set as the default for opening PDF files.
If you wish to set this product as the default for opening PDF files, please select “SkyPDF 8”.